package com.xlong.android.app;

import android.content.Context;
import android.os.Environment;

import java.io.File;
import java.math.BigDecimal;

/**
 * 数据缓存管理器
 * 描    述:  主要功能有清除内/外缓存，清除数据库，清除sharedPreference，清除files和清除自定义目录
 */
public class CacheDataManager {

    public static String getTotalCacheSize(Context context) throws Exception {

        long cacheSize = getFolderSize(context.getCacheDir());

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

            cacheSize += getFolderSize(context.getExternalCacheDir());

        }

        return getFormatSize(cacheSize);

    }

    public static void clearAllCache(Context context) {

        deleteDir(context.getCacheDir());

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            deleteDir(context.getExternalCacheDir());
        }

    }

    private static boolean deleteDir(File dir) {

        if (dir != null && dir.isDirectory()) {

            String[] children = dir.list();

            for (int i = 0; i < children.length; i++) {

                boolean success = deleteDir(new File(dir, children[i]));

                if (!success) {

                    return false;

                }

            }

        }

        return dir.delete();

    }

    // 获取文件

    // Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/

    // 目录，一般放一些长时间保存的数据

    // Context.getExternalCacheDir() -->

    // SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据

    public static long getFolderSize(File file) throws Exception {

        long size = 0;

        try {

            File[] fileList = file.listFiles();

            for (int i = 0; i < fileList.length; i++) {

                // 如果下面还有文件
                if (fileList[i].isDirectory()) {
                    size = size + getFolderSize(fileList[i]);
                } else {
                    size = size + fileList[i].length();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return size;
    }

    /**
     * 格式化单位
     *
     * @param size
     */

    public static String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return "0KB";
        }
        double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(0, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(0, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(0, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
        }

        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(0, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
    }

}
